Properties of the Number 3981

Three Thousand Nine Hundred Eighty-One

Basics

Value: 3980 → 3981 → 3982

Parity: odd

Prime: No

Previous Prime: 3967

Next Prime: 3989

Digit Sum: 21

Digital Root: 3

Palindrome: No

Factorization: 3 × 1327

Divisors: 1, 3, 1327, 3981

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 111110001101

Octal: 7615

Duodecimal: 2379

Hexadecimal: f8d

Square: 15848361

Square Root: 63.095166217389426

Classification

Fibonacci: No

Bell Number: No

Factorial Number: No

Regular Number: No

Perfect Number: No

Special

Kaprekar Constant: No

Munchausen Constant: No

Armstrong Number: No

Kaprekar Number: No

Catalan Number: No

Vampire Number: No

Taxicab Number: No

Super Prime: No

Friedman Number: No

Fermat Number: No

Cullen Number: No

OEIS Sequences

Number of "ON" cells at n-th stage in simple 2-dimensional cellular automaton (same as A160410, but a(1) = 1, not 4). A160414

Expansion of ∏_k>=1 (1+x^3·k-1)^k. A262878

T(n,k)=Number of length n+4 0..k arrays with every five consecutive terms having four times some element equal to the sum of the remaining four. A249656

Composites whose prime factorization in base 12 is an anagram of the number in base 12. A260055

Expansion of ∏_k>=1 1/(1-x^k+3)^k. A263359

Number of ON cells at n-th stage in simple 2-dimensional cellular automaton (see Comments lines for definition). A256530

a(n) = (p(n)*p(n+2) - p(n+1))/2, where p(n) is the n-th odd prime. A152531

Powers of fifth root of 10 rounded to nearest integer. A18142

Nonprime numbers k such that sum of aliquot divisors of k is a cube. A48698

Numbers k such that the digits of k^1/6 begin with k. A331493